Would suggest removing all electronics and keeping them in a climate controlled space (under your bed
for example). Most units un-plug so this is not a high tech project
. Besides protecting them from the freezing and thawing of condensation
inside the unit (on the circuit boards) this is the ultimate theft deterent project
you can implement. Of course if you were truly concerned about your boats well being You would take it somewhere warm ,chuckle, chuckle. Currently in herb river ga and south bound.